I think I found a loophole (but need an atty Tx. atty to confirm )
Reading over what they claim is there copyright I noticed that all the terms are capitalized. When reading over Texas property laws,
http://www.law.ttu.edu/lawlibrary/library/research/bapcpa_library/texas-property-code.htm"§ 41.005. VOLUNTARY DESIGNATION OF HOMESTEAD
(a) If a rural homestead of a family is part of one or more parcels containing a total of more than 200 acres, the head of the family and, if married, that person's spouse may voluntarily designate not more than 200 acres of the property as the homestead. If a rural homestead of a single adult person, not otherwise entitled to a homestead, is part of one or more parcels containing a total of more than 100 acres, the person may voluntarily designate not more than 100 acres of the property as the homestead.
(b) If an urban homestead of a family, or an urban homestead of a single adult person not otherwise entitled to a homestead, is part of one or more contiguous lots containing a total of more than 10 acres, the head of the family and, if married, that person's spouse or the single adult person, as applicable, may voluntarily designate not more than 10 acres of the property as the homestead. "
or read over the TX Affidavit of Urban Homestead and Designation of Homestead or "CREDITOR CLAIMS IN PROBATE, HOMESTEAD, EXEMPT PROPERTY, ALLOWANCES, SALES OF PROBATE PROPERTY AND LIABILITY OF PERSONAL REPRESENTATIVE FOR TAXES". I can keep going since it appears the words appear a lot in Texas Law and Texas history
Texas law does not capitalize the whole words. So .... if I do not capitalize the complete words as in their cease and desist, then I am only referring to Texas law and not their claim to a copyright. I think a state law counters any copyright claim.
To paraphrase Davy Crockett, You may all go to Hell, I am in Texas !
( they may also want to read over Federal law also as in, 24 CFR 30.30 - Urban Homestead violations and send Obama a copy of their cease and desist also )
Since they are in California, they should have research the Compac computer company and its claim against Compaq Computer Company and see how sometimes a claim can backfire on you.